<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
     //第一种
      console.log(Array.isArray([1,2,3]))
      //第二种
      console.log([].constructor ===Array)
      //第三种
      function isArray(date){
        return Object.prototype.toString.call(date) ==='[object Array]'
      }

    </script>
  </body>
</html>
